scholarly journals A SCALING RELATION WITH ROLLING TACHYON FIELDS AND COSMIC ACCELERATION

2021 ◽  
Vol 2 (3) ◽  
Keyword(s):  
Cosmic Acceleration ◽  
Scaling Relation

scholarly journals Constraining the Swiss-Cheese IR-Fixed Point Cosmology with Cosmic Expansion

Universe ◽  
2021 ◽  
Vol 7 (8) ◽  
pp. 263
Author(s):  
Ayan Mitra ◽  
Vasilios Zarikas ◽  
Alfio Bonanno ◽  
Michael Good ◽  
Ertan Güdekli
Keyword(s):  
Fixed Point ◽  
Cosmological Constant ◽  
Cosmic Acceleration ◽  
Fine Tuning ◽  
Clusters Of Galaxies ◽  
Swiss Cheese ◽  
Coincidence Problem ◽  
Cosmological Expansion ◽  
Cosmic Evolution ◽  
Previous Assumption

A recent work proposed that the recent cosmic passage to a cosmic acceleration era is the result of the existence of small anti-gravity sources in each galaxy and clusters of galaxies. In particular, a Swiss-cheese cosmology model, which relativistically integrates the contribution of all these anti-gravity sources on a galactic scale has been constructed assuming the presence of an infrared fixed point for a scale dependent cosmological constant. The derived cosmological expansion provides an explanation for both the fine tuning and the coincidence problem. The present work relaxes the previous assumption on the running of the cosmological constant and allows for a generic scaling around the infrared fixed point. Our analysis reveals that, in order to produce a cosmic evolution consistent with the best ΛCDM model, the IR-running of the cosmological constant is consistent with the presence of an IR-fixed point.

Cosmic acceleration and stability of cosmological models in extended teleparallel gravity

Pramana ◽  
2021 ◽  
Vol 95 (1) ◽  
Author(s):  
A Y Shaikh ◽  
S V Gore ◽  
S D Katore
Keyword(s):  
Teleparallel Gravity ◽  
Cosmological Models ◽  
Cosmic Acceleration

Scaling Relation of the Scalar Diffusion in a Rotating Mixer

2021 ◽  
Author(s):  
Na Sun ◽  
Lipo Wang ◽  
Yuanbo Li ◽  
Lin Li ◽  
Shuaipeng Qi ◽  
...  
Keyword(s):  
Scaling Relation ◽  
Scalar Diffusion

Cosmic Acceleration: A Natural Remedy For Horizon and Flatness Problems

2005 ◽  
Vol 201 ◽  
pp. 488-489 ◽  
Author(s):  
Abhas. Mitra
Keyword(s):  
Initial Phase ◽  
Cosmic Acceleration ◽  
Natural Remedy

By assuming that the recently found cosmic acceleration is a genuine and ever present effect, we show that, the resultant modified Friedman model is free from the horizon and flatness problems; and there is no need to invoke the additional “inflationary” initial phase as a separate ingredient.

scholarly journals Multi-field dark energy: Cosmic acceleration on a steep potential

2021 ◽  
pp. 136427
Author(s):  
Yashar Akrami ◽  
Misao Sasaki ◽  
Adam R. Solomon ◽  
Valeri Vardanyan
Keyword(s):  
Dark Energy ◽  
Cosmic Acceleration

scholarly journals Cosmic acceleration data and bulk-brane energy exchange

2007 ◽  
Vol 76 (8) ◽  
Author(s):  
C. Bogdanos ◽  
S. Nesseris ◽  
L. Perivolaropoulos ◽  
K. Tamvakis
Keyword(s):  
Energy Exchange ◽  
Cosmic Acceleration ◽  
Acceleration Data
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